For consistent high quality results from your Samsung ML-2850 series laser printer, choose a genuine Samsung Black Toner Cartridge. The red error light on your Samsung printer will flash when the toner cartridge is nearly exhausted, so make sure to order a replacement as soon as possible. When the light is solid red, the current cartridge is exhausted and must be replaced. This standard yield toner cartridge is packed with black toner to print 2000 pages.